refs #250, helper methods

* in aircraft class to compare COM
* in context / runtime component to check vitality of core

src/blackcore/context_runtime.cpp

@@ -398,6 +398,20 @@ namespace BlackCore
         m_init = true;
     }
 
+    bool CRuntime::hasRemoteApplicationContext() const
+    {
+        Q_ASSERT(this->m_contextApplication);
+        return !this->m_contextApplication->usingLocalObjects();
+    }
+
+    bool CRuntime::canPingApplicationContext() const
+    {
+        Q_ASSERT(this->m_contextApplication);
+        if (this->m_contextApplication->usingLocalObjects()) return true;
+        qint64 token = QDateTime::currentMSecsSinceEpoch();
+        return (token == this->m_contextApplication->ping(token));
+    }
+
     void CRuntime::initDBusServer(const QString &dBusAddress)
     {
         if (this->m_dbusServer) return;

src/blackcore/context_runtime.h

@@ -187,6 +187,11 @@ namespace BlackCore
         //! Init
         void init(const CRuntimeConfig &config);
 
+        //! Remote application context, indicates distributed environment
+        bool hasRemoteApplicationContext() const;
+
+        //! Is application context available?
+        bool canPingApplicationContext() const;
 
     private:
         bool m_init; /*!< flag */

src/blackgui/runtimebasedcomponent.h

@@ -88,6 +88,12 @@ namespace BlackGui
         //! \remarks use this methods to hook up signal/slots with runtime
         virtual void runtimeHasBeenSet() {}
 
+        //! \copydoc CRuntime::hasRemoteApplicationContext
+        bool hasRemoteApplicationContext() const { return this->m_runtime->hasRemoteApplicationContext(); }
+
+        //! \copydoc CRuntime::canPingApplicationContext
+        bool canPingApplicationContext() const { return this->m_runtime->canPingApplicationContext(); }
+
     private:
         BlackCore::CRuntime *m_runtime;
         bool m_runtimeOwner;

src/blackmisc/avaircraft.cpp

@@ -55,6 +55,14 @@ namespace BlackMisc
             return this->m_distanceToPlane;
         }
 
+        /*
+         * Same COM system data
+         */
+        bool CAircraft::hasSameComData(const CComSystem &com1, const CComSystem &com2, const CTransponder &transponder)
+        {
+            return this->getCom1System() == com1 && this->getCom2System() == com2 && this->getTransponder() == transponder;
+        }
+
         /*
          * Valid for login
          */

src/blackmisc/avaircraft.h

@@ -138,6 +138,9 @@ namespace BlackMisc
             //! \brief Set COM2 system
             void setCom2System(const CComSystem &comSystem) { this->m_com2system = comSystem; }
 
+            //! Identical COM system?
+            bool hasSameComData(const CComSystem &com1, const CComSystem &com2, const CTransponder &transponder);
+
             //! \brief Is any (COM1/2) active frequency within 8.3383kHz channel?
             bool isActiveFrequencyWithin8_33kHzChannel(const BlackMisc::PhysicalQuantities::CFrequency &comFrequency) const
             {